Two separate reports more or less confirm what most people were expecting from the Apple, Inc. (NASDAQ:AAPL) iPhone 5 upon its announcement on September 12 – demand that could translate to the most successful iPhone launch in history.

Natalie Kerris, a spokesperson for Apple, informed the Loop through a statement that there have been an “incredible” amount of iPhone 5 pre-orders, which has led Apple to be “blown away” by the overwhelming demand.

At the present, the iPhone 5 is sold out on pre-orders at two carriers – AT&T, Inc. (NASDAQ:T) and Verizon Wireless (NASDAQ:VZ) – and the waiting time for a 16 GB iPhone 5 on Sprint Nextel Corp. (NASDAQ:S) is currently two weeks.

The two other variants (32 GB and 64 GB internal storage) are still available for pre-order through Sprint. The iPhone 5 will officially hit stores on September 21, but many customers may have to wait longer due to the tremendous demand for the device.

Also, Apple Vice President of Worldwide Marketing Philip Schiller had announced today that 2 million pre-orders for the iPhone 5 were taken in its first 24 hours. This approximately doubled the previous first-day pre-order record for the iPhone 4S.

Analyst Eugene “Gene” Munster of Piper Jaffray is forecasting that 10 million iPhone 5 units will be sold in the month of September, which would be only ten days starting from September 21 and ending on the 30th.

By the looks of things, Apple has a very good chance of achieving that feat.